TiNi形狀記憶合金與不銹鋼瞬間液相擴(kuò)散焊工藝及接頭性能研究.pdf

1、北京工業(yè)大學(xué)碩士學(xué)位論文TiNi形狀記憶合金與不銹鋼瞬間液相擴(kuò)散焊工藝及接頭性能研究姓名：汪應(yīng)玲申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：栗卓新20090501ABSTRACTABSTRACTTiNishapememoDralloy(SMA)exhibitsspecialshapememo巧effect(SME)andSuperelasticity(SE)，aswell觴excellentdampingcapacityanderos

2、ionresistanceIthasbeenwidelyusedinspaceflightnuclearpowerindustryengineeringandmedicaltechnologyetcHoweversuccessfulcommercialapplicationofTiNialloysislargelylimitedduetoarelativelyhighcostTherefore，processesforjoiningTi

3、NiSMAandothercheapermaterialsaregainingincreaSinginterestStainlesssteel(SS)isusuallyconsideredforitsexcellentproperties，lowpriceandwideapplicationHowevertheweldabilityofthesetwoalloysispoorbecauseofthelargedifferenceinpl

4、aysicalandchemicalpropertiesOntheonehand，nlecoarsecastingstructureandbrittleintermetallliccompoundsaredeleterioustojointpropertiesduringfusionweldingOntheotherhand，thecorrosionresistanceofjointisdecreasedforusingbrazeall

5、oysduringthebrazingprocessInthispaperTiNiSMAandSSwerebondedbytransientliquidphase(TLP)diffusionbonding、Ⅳitll501amAgCumetalfoils嬲theinterlayerTheeffectofdifferentheatingtemperature，holdingtimeandbondingpressureonmicrostru

6、ctureandpropertiesofjointswasinvestigatedsystemically碭emicrostructuresandcompositionsofthefractureandthejointinterfaceoftheoptimizedprocessparameterswereanalyzedbyscanningelectronmicroscope(SEM)andenergydispersivespectro

7、scopy(EDS)Besides，thecorrosionresistanceofjiontsWaSalsoevaluatedbyelectrochemicaltestn圮resultsindicatedthatTiNiSMAand304weresuccessfullybondedwithAgCuinterlayerbyTLPdiffusionbondingThebondingparametershadobviouseffectont

8、heshearstrengthofthejointWiththeincreaSeofheatingtemperatureortheprolongingofholdingtime，theshearstrengthofjointinterfaceshowedthetrendofincreaSingfirstlyandthendecreaSingHoweverexcessivelyelevatedtemperatureorprolongedt

9、ime，orincreaSedpressuremightreducetheshearstrengthThemaximumshearstrength234／VIPawasgainedat860。Cfor60min、析tllaspecificpressureofO05MPaThekindsandquantitiesofproductsformedinthejointinterfacewouldchanged，whentheTLPdiffus

10、ionbondingparametersweredifferentIftheheatingtemperaturesistoohi曲orthebondingtimeistoolong，aseriesofbrittleintermetalliccompounds，suchasTiNi2，TiNiCuTiFeandSOonmayformatinterface，whichwoulddecreasedthemechanicalproperties